David Beckham will try to cement his Major League Soccer legacy with a championship on Sunday when his Los Angeles Galaxy take on the Houston Dynamo for the MLS Cup. He is in the last year of a ground-breaking five-year deal with the Galaxy. He could yet extend his tenure in Los Angeles, or he could make a move back to Europe, where French club Paris Saint-Germain have expressed interest. Beckham says he won’t even think about that until after Sunday, when he hopes to add an MLS title to the six English league titles he won with Manchester United and the Spanish league crown he claimed with Real Madrid. The fact that the Galaxy’s home ground of the Home Depot Center, in suburban Carson, was selected as the venue for the MLS Cup means Beckham has a chance to go out on a high note in front of the fans who greeted him five years ago. Beckham, however, insisted his desire for the title is not a personal quest. “I think wherever you play, whatever you want to do in your life, you want to be successful,” he said.